feature #46821 [FrameworkBundle] Add resolve-env option to debug:config command (alexandre-daubois)

This PR was merged into the 6.2 branch.

Discussion
----------

[FrameworkBundle] Add `resolve-env` option to debug:config command

| Q             | A
| ------------- | ---
| Branch?       | 6.2
| Bug fix?      | no
| New feature?  | yes
| Deprecations? | no
| Tickets       | Fix #40582
| License       | MIT
| Doc PR        | _NA_

Add `--resolve-env` option to `debug:config` command to display actual values of environment variables in dumped configuration.

This main purpose of this command is debugging as its name suggests. In order to help the developer to debug its configuration, it is convenient to display the actual value of environment variables present in the dumped configuration, instead of placeholders.

Here is the result:

```
$ symfony console debug:config framework | grep secret
    secret: '%env(APP_SECRET)%'
    secrets:
        vault_directory: '/home/alexandredaubois/(...)/config/secrets/%env(default:kernel.environment:APP_RUNTIME_ENV)%'

$ symfony console debug:config framework --resolve-env | grep secret
    secret: 90d83502629d64dec4cd6e33c9b31267
    secrets:
        vault_directory: /home/alexandredaubois/(...)/config/secrets/dev
```

Commits
-------

bdc8e0224c [FrameworkBundle] Add `resolve-env` option to debug:config command

Author: fabpot

CHANGELOG.md

@@ -8,6 +8,7 @@ CHANGELOG
  * Add argument `&$asGhostObject` to LazyProxy's `DumperInterface` to allow using ghost objects for lazy loading services
  * Add `enum` env var processor
  * Add `shuffle` env var processor
+ * Add `resolve-env` option to `debug:config` command to display actual values of environment variables in dumped configuration
 
 6.1
 ---